The nation as a whole is red, with conservative books making up 56 percent of purchases, among top-selling political books. Washington is only slightly paler red, at 54 percent.

In fact, just five states are blue, and they’re all in the Northeast: New York, Connecticut, Massachusetts, Rhode Island and Vermont. Washington, D.C., is also blue.

The spectrum runs from Vermont, at 61 percent blue, to Mississippi, at 72 percent red.

Amazon inserted a caveat, noting:

Amazon customers, as we know, read widely and often buy books that don’t necessarily fit their own views. Books aren’t votes, and a map of book purchases can reflect curiosity as much as commitment, but we hope our 2012 Election Heat Map will provide one way to follow the changing political conversation across the country during this election season.